Two favorites: First is Baker's One Bowl Brownies. Baker's Unsweetened Chocolate is sold in the orange box near the chocolate chips....follow the recipe but bake it a couple of minutes less than their time for gooeyer brownies.
Mock Cobbler
Spray-grease (or grease) a 9 x 13 inch pan. Spread two cans of fruit pie filling evenly on the bottom. Spread a box of dry cake mix over the top; spread evenly and break up bigger lumps with your fingers. Slice two sticks of butter pretty thin and arrange evenly on top of the dry cake mix.....bake at 350 for 45 minutes or until bubbly and all cake mix is moistened. The fun part is choosing the combinations of fruit filling and cake mix. My favorites are peach with spice cake and cherry with devils food mix. The last one is pretty over-the-top sweet but if you need a chocolate/sugar fix....that's the one to use. I've also tried blueberry with butter cake, cherry with white cake (not so impressed) and blueberry with lemon.